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Dependence of the functional characteristics of thermomechanically processed titanium nickelide on the size of the structural elements of austenite

  • Structure, Phase Transformations, and Diffusion
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Abstract

Effect of the size of the elements of the mixed structure of B2 austenite, which consists of nanosized grains and subgrains of a polygonized substructure, on the functional properties of the Ti–50.7 at % Ni alloy preliminarily subjected to a low-temperature thermomechanical treatment (LTMT) and post-deformation annealing (PDA), has been investigated. The generation of the shape-memory effect (SME) and reversible two-way SME (TWSME) was performed using bending deformation. A maximum (for the Ti–Ni alloys) value of the recovery strain εr = 15.5 ± 0.5% has been obtained after annealing at 600°C for 1 h (recrystallized structure) and after LTMT + PDA at 430°C for 10 h (mixed nanocrystalline and nanosubgrain structure). The behavior of the parameters of the SME and TWSME in different structural states has been considered. A comparative study of the effect of the temperature and time of holding at a temperature upon the PDA on the formation of the microstructure and submicrostructure of the B2 austenite has been performed.

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Correspondence to E. P. Ryklina.

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Original Russian Text © K.A. Polyakova-Vachiyan, E.P. Ryklina, S.D. Prokoshkin, S.M. Dubinskii, 2016, published in Fizika Metallov i Metallovedenie, 2016, Vol. 117, No. 8, pp. 845–855.

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Polyakova-Vachiyan, K.A., Ryklina, E.P., Prokoshkin, S.D. et al. Dependence of the functional characteristics of thermomechanically processed titanium nickelide on the size of the structural elements of austenite. Phys. Metals Metallogr. 117, 817–827 (2016). https://doi.org/10.1134/S0031918X16080123

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